Badalyan, Samvel and Fabian, Jaroslav
Spin edge helices in a perpendicular magnetic field.
Physical Review Letters (PRL) 105, p. 186601.
Other URL: http://link.aps.org/doi/10.1103/PhysRevLett.105.186601
We present an exact solution to the problem of the spin edge states in the presence of equal Bychkov-Rashba and Dresselhaus spin-orbit fields in a two-dimensional electron system, restricted by a hard-wall confining potential and exposed to a perpendicular magnetic field. We find that the spectrum of the spin edge states depends critically on the orientation of the sample edges with respect to the crystallographic axes. Such a strikingly different spectral behavior generates new modes of the persistent spin helix—spin edge helices with novel properties, which can be tuned by the applied electric and magnetic fields.